--Mr. Smith, Can you give us some advice on how to learn English well’?--Remember, Nothing can be learned well ______hard work.
I haven’t decided when __________ a holiday yet.
Many young people took part in _______ trees on Tree Planting Day.
Finish your homework first, then you’ll _____watch TV for an hour.
---What’s wrong with you ? ---________.
They arrived while we__________ dinner.